Newspaper-press blanket



Feb. 19, 1929. 1,702,620

' W. A. SCHWARTZ NEWSPAPER PRESS BLANKET Filed Nov. 17, 1926 In 0P1: for m lldrd A- St/lldariid' I JII'or/my,

Patented Feb. 19, 1929.

UNlTED STATES WILLARD A. SCHWARTZ OF LOS ANGELES, CALIFORNIA.

NEWSPAPER-PRESS BLANKET.

Application filed November 17, 1926. Serial No. 148,826.

This invention relates to improvements in printing press blankets and more particularly to surfacings for the impression CYllINlQI'S of rotary presses.

in high speed. presses, such as commonly employed for printing newspapers, the print paper is moved between two cylinders,'each of which is of cylindrical drum-shape and constructed of metal, the one is arranged for the carrying of a type-plate and the other arranged for the carrying of a surfacing element designed to furnish the degree of printing pressure, or impresslon, upon the paper to receive the desired imprint from the inked type surface.

The requirement and desideratum here is that the surface of the impression cylinder be yielding to assure full and perfect contact between the paper and inked type surface, but to such extent, as to provlde only a very slight depression of the type into the print-paper, and, that the surface be of such nature as to maintain such impression condition for a considerable period of use.

A blanket, extensively used, is formed of a sheet of felt, or matted wool fiber, over which there is a draw-sheet of textile fabric. This blanket, when new is too soft and permits too great depression of the type in the" print paper; by continued use the felt packs which causes nonuniformity of impression.

Another blanket, also extensively employed comprises a sheet of felt having a sheet rubber facing, by which effort was made to overcome the tendency for the felt to pack, but which has relatively short life due to rapid deterioration of the rubber, as by drying and cracking and by rotting due to oil and grease.

In still another blanket, also in extensive use, comprisin a sheet of cork having a cloth facing effort was made to overcome the softness of the felt blankets but which has not proven wholly satisfactory for the reason that it is too hard, the result being too light impression.

All'of the blankets, recited, are lamellar, in which the several component lamellae are relatively secured by an adhesive, which, adhesive, by drying and aging subjects the sheet, or blanket, as a whole, to too severe hardness and to cracking.

Among the objects of my invention is to construct and furnish a blanket, or impression, surface, for printing cylinders, which will provide substantially constant impression condition; be highly flexible, hence practically crack-proof; which will not be subject to deterioration by oil, or grease, rotting; not subject to deterioration by drying out, not subject to packing or change in its impression condition, and which is relatively inexpensive to manufacture.

My improvement consist in the novel combination and nature of materials employed as hereinafter fully, clearly and concisely described, definitely pointed out in my claims and illustrated by the accompanying drawing (1 sheet) in which Fig. 1, shows,in perspective, a length, or fragment, of a blanket constructed in accordance with my invention.

Fig. 2, is an enlarged, diagrammatical, sectional elevation as taken on the line indicated 2'--2 of Fig. 1.

Fig. 3, illustrates diagrammatically an apparatus capable of producing my blanket.

Fig. 4, illustrates the application of a blanket to the impression roller of a rotary printing press.

Referring more specifically to the drawing A, B, and C designate the layers, of laminae, of which A and B are outer layers and C an intermediate layer.

Adhesively uniting the layers A and C is a film, or coat, of an adhesive compound D, and, similarly between the layers B and C is a film, or coat, E of the same adhesive compound.

By preference the layers A, B and Care strips of woven textile fabric, having a weight, weave and consistency of eleven ounce (11 oz.) cotton canvas, which is material, I have found produces the desired result.

The recited three layers of such canvas is a bed-thickness which best serves the purpose, and the canvas of woven cotton threads is formed to very well resist tear- 1ng, and wearing by use. Such a blanket, however, of the layers of canvas, alone, is not sufliciently resilient forimpression purposes, and to this end then I incorporate a quality in the adhesive which secures 'the several layers of canvas, which quality I obtain without the heretofore accompanying brittleness, hardness, quick-drying and weak-adhesion in other makes of blankets.

Isinglass 1 Gelatin glue 8 Corn sirup 3 Glycerin 2 In Fi 3 of the drawin I show one simm b ple manner of producing the material of my blanket in wh1ch the la er C 18 directed a u through a tank 10 contaimng the descr1bed adhesive and the several layers brought to superposed position and have pressure applied. A

It is to be noted that the outer surfaces of the outer fabric layers A and B are exposed so as to present the fabric to the action of Wear, and that the resilient layers are covered so as not to be subjected to wear and also be protected against the action 01": the atmosphere or of ink, grease, or other substances that may be deposited on the blanket. This renders the blanket highly durable.

I claim:

1. A press blanket comprising three layers of cotton canvas relatively secured by a compound consisting of isinglass, gelatin glue, corn sirup and glycerin.

2. A press blanket comprising three layers of eleven ounce (11 oz.) cotton canvas, relatively secured by a compound whose formula is is'inglass-one ounce; gelatin glueeight ounces; corn sirup-three ounces, and glycerintwo ounces.

3. A press blanket comprising outer layers of textile fabric between which an intermediate layer is interposed, and layers of resilient, flexible and non-drying adhesive material interposed between said fabric layers and adhered thereto throughout the contiguous surfaces thereof.

In testimony whereofl have afiixed my signature.

WILLARD A.V SCHWARTZ. 

